Agitator



J. E. BOND AGITATOR June 4, 192

Filed March 5, 1928 a w w w 6 J 6 2 J y Z a E w 5 6 l J 2 m MM a M M *1u M v n 0 m l d m f .I. J J %L@. WW A Ev 2 a Z Patented June 4, 1929.

UNITED STATES PATENT OFFICE.

AGITATOR.

Application filed March 5, 1928. Serial No. 259,078.

My invention relates to the art of paper making and particularly tomeans for agitating paper pulp.

In the development of the art it has been found possible to greatlyincrease the capacity of a given equipment by increasing the density(or, in other words, lessening the fluidity) of the pulp during itstreatment preceding delivery to the Fourd riniers.

While in the old practice a 2 pulp was considered proper and of themaximum density possible, it is now common to deal with 6% solutions,with correspondingly increased production capacity.

However, many diflicult problems are encountered in handling pulp ofthis density due to its lack of fluidity and its tendency to mass orcake in the storage or treatment tanks and containers. This tendency isinherent in the nature of the material under treatment due to itsfibrous character and pulp in the liquid and to maintain auniformdensity throughout the entire body of material it must be kept inmotion and the motion producing means should have a tendency to break upand tear apart any large or small masses of pulp. In the old practicethe mixture was kept in motion by means of paddles or impellers in thetank,

but this apparatus had very little tendency to breakup masses of pulp,and was wholly ineffective with stock of increased density. Furthermore,such apparatus required an outlay of power not commensurate with theresults secured.

The tanks, chests or containers which are in place and must be utilizedfor the new plan of operation are of many and varied forms, all of greatsize, some narrow and of great length, some deep and some round. Theproblem has been, therefore, to provide means applicable to thesevarious forms of tanks that would insure effective circulation,

the breaking up of pulp masses and the maintenance at all times of aproper consistency throughout the whole volume of material, with aminimum of power expenditure.

Because of the use of various sizes and shapes of storage and agitatortanks, it has been found necessary to modify the usual construction tomeet the different requirements. In the invention herein disclosed arelatively tall, round tank is employed and it has been foundexceedingly difficult to properly agitate the stock. Accordingly twopumps have been provided each discharging the stock at a differentlevel, through laterally disposed nozzles, the second pump operatingonly when the stock reaches a predetermined level in the tank. Thus theentire body of stock is constantly broken up and agitated, regardless ofthe amount in the tank. A float, located in the tank, automaticallyturns on the pump motor when the stock reaches a predetermined level andstops the motor when the stock falls below that level.

The invention will be more readily understood by reference to theaccompanying drawing, in which- Fig. 1 is a plan view of a deviceconstructed according to my invention, and

Fig. 2 is a sectional elevation thereof.

By referring to the drawings and more particularly to Fig. 2, it will beseen that I have provided a relatively deep circular tank 10, having aconical bottom inwhich are located' discharge openings 11, 12. Inletpipes 11 and 12 are joined to the pump 13, which is operated by themotor 14. An outlet or discharge pipe 15 serves to carry the dischargeinto the tank. The discharge pipe 15 is located at a convenient heightin the tank, and terminates in a plurality of radially disposed nozzles16, which are directed against the side of the tank 10.

A secondpump 17, operated by the motor 18, has an inlet 19 joined to thepump by a pipe 20. An outlet or discharge pipe 21, serves to carry thepump discharge into the tank 1O. The discharge pipe 21 in the tank islocated above and in a plane parallel to the discharge pipe 15, andlikewise terminates in a plurality of outwardly disposed nozzles 22.

Within the tank is located a float 23, which is operatively connected bymeans of the cable 24 and pulleys 25, 26, to the switch box 26. By meansof the float 23, the motor 18 may be started and stopped at anypredetermined point. The mass within the tank may be drawn off throughthe discharge aperture 11 and pipe 27.

In operation, a suit-able amount of paper stock is placedin the tank,and the pump 13 caused to operate. The forced discharge of the stockthrough the nozzles will serve not only to break up the particles, butto impart a motion to the mass adjacent to the nozzles, thus, in ameasure, avoiding the tendency of cohesion of the mass.

If more stock is added to the mass already in the tank, the one pumpwould be unable to circulate the mass sufliciently to' avoidStratification. The second pump is therefore utilized, it beingoperatively vconnected to the float 23, so that when the mass within thetank reaches a predetermined level, such as indicated by the float indotted lines in Fig. 1, the motor will be started. Likewise, when thelevel is lowered due to stock being drawn oil, the motor 18 will bestopped.

Thus it will be seen that I have provided a device which is simple inoperation and yet thoroughly eflicient for the purpose intended. Thetank being of circular form, and motion being imparted to the mass, willkeep the same constantly moving and prevent Stratification.

Obviously modifications and variations may be made in the device hereinillustrated, and I do not Wish to be limited except as indicated in theappended claims.

I claim:

1. In combination, a container, a pump having its inlet connected to thebottom of the tank, an outlet pipe extending across the tank andterminating in a plurality of outlets, a second pump having an inletconnected to the lower part of the tank and an outlet pipe extendingacross the tank at a point materially above said first outlet pipe, amotor for operating said second pump, a float in said tank substantiallythe level of said second pipe and means operated by said float forstarting the motor for operating said second pump when the level ofliquid reaches a point above said second pipe.

2. In combination, an open top tank, an exterior pump, having an inletin the bottom wall of said tank, an outlet pipe extending across saidtank and terminating in a plurality of radial outlets, a second umphaving an inlet in the bottom. wall 0 said tank, an outlet pipeextending across the tank a material dlstance above said first mentionedoutlet and terminating in a plurality of radial ports, a motor foroperating said second pump, and automatic means in said tank foroperating said second pump at a predetermined liquid level in said tank.

3. In combination, an open top tank, an exterior pump having an inlet inthe bottom wall of said tank, an outlet pipe extending across said tankand terminating in a plurality of radially disposed nozzles, a secondexterior pump having an inlet in the bottom wall of said tank and anoutlet pipe extending across the tank a material distance above saidfirst mentioned outlet and terminating in a plurality of radiallydisposed nozzles, a motor for operating said second pump, and automaticmeans in said tank for operating said second pump at a predeterminedliquid level in said tank.

4. In combination, an open top tank, an exterior pump having an inlet inthe bottom wall of said tank, an outlet pipe therefor passing throughand across said tank and terminating in a plurality of radially disposednozzles, a second exterior pump having an inlet at the bottom of saidtank and an outlet pipe passing through and across said tank, andterminating in a plurality of radially disposed nozzles, and automaticmeans for operating said second pump when the substance within said tankreaches a predetermined level. n

5'. In combination, an open top tank, an exterior pump having an inletin the bottom wall of said tank, an outlet pipe therefor passing throughand across said tank and terminating in a plurality of radially disposednozzles, a second exterior pump, having an inlet in the bottom of saidtank and an outlet p'ipe passing through and across said tank andterminating in a plurality of radially disposed nozzles and a floatwithin said tank, said float being operatively connected to said secondmotor, whereby to operate said second motor at a preldetermined level ofthe contents of said tan 6. In combination, an open top tank, anexterior pump having an inlet in the bottom wall of said tank, an outletpipe therefor passing through and across said tank and terminating in aplurality of radially disposed nozzles a second exterior pump having aninlet in the bottom of said tank and an outlet pipe passing through andacross said tank and terminating in a plurality of radially disposednozzles, and a float within said tank, said float being operativelyconnected to said second motor, whereby to operate said second motorwhen the contents of said tank reach the level of said second outletnozzles.

7. In combination, an open top tank, an exterior pump having an inlet inthebottom wall of said tank, an outlet pipe therefor passing through andacross said tank and rality of ram. .y and outwardly disposedterminating in a plurality of radially and nozzles and automatic meansfor operating outwardly disposed nozzles, 21 second exsaid second pumpwhen the substance within 10 terior pump, having an inlet pipe commonsaid tank reaches a predetermined level.

to said first pipe in the bottom of said tank In testimony whereof Ihave afiixed my and an outlet pipe passing through and signature.

across said tank, and terminating in a plu- JOSEPH E. BOND.

